KR101599126B1 - Mold forming machine of lid - Google Patents

Abstract

The present invention relates to a screw-type lid-forming apparatus capable of effectively cooling an inner screw portion of a lid to minimize damage of a screw portion due to frictional resistance when an injection-molded article is taken out after molding.

Description

[0001] Mold forming machine of lid [0002]

The present invention relates to a screw-type lid-forming apparatus, and more particularly, to a screw-type lid-forming apparatus for improving the structure of a lid-forming apparatus to minimize damage to a screw portion due to frictional resistance during lid- .

As shown in Figs. 6, 7 and 8, a conventional safety lid is used for a container cast on an internal mold member and having an axially opposite shoulder 9 of a radially inward extension located below the thread neck and threaded neck It is a plastic pilot lid which is applied as much as possible and whose lid has a top wall 1 and a depending skirt 2 having an internal thread 4 for engaging the threaded neck 6 of the container, And a safety ring 3 connected to the lower end of the skirt by a rigid device and a radially inwardly extending locking device 8 is adapted to slide over the shoulder 9 as the lid is screwed onto the container, In which the rigid device 7 is released and the ring 3 is detached from the skirt 2 of the lid and applied to the shoulder 9, The skirt (2) and the ring (3) B) the locking device 8 comprises a radially inwardly extending projection extending around the inner circumference of the ring and the projection 15 has a radially inwardly facing surface and the rest of the surface Characterized by having a plurality of circumferentially spaced surfaces (16) arranged radially inwardly.

And a mold 50 for manufacturing a plastic lid having a ring which is separated from the side wall by a ring-shaped recess circumferentially spaced apart from the side wall and connected to the side wall by an unstable member, A male member 52 forms an orifice 58 for guiding the socket 56 and the plastic material into the socket 56 and b) the male member 54 is laterally extended into the socket 56, (C) an upper device (60, 62, 64) forming an upper portion of the socket, ii) a lower portion of the socket A lower device having a plurality of radially moveable cam members to form a circumferentially spaced section of the male member core device 78 to form a circumferentially spaced recess in the lid, The cam member 74 .

A conventional safety lid and a molding method thereof and a molding method for the apparatus are characterized in that a plastic material such as polypropylene is injected through the orifice 158 to form a lid of the container to form a gap between the arm member 52 and the male member 54 Thereby filling the mold cavity formed in the mold cavity. The cooling water is guided through the water supply passages (72) and (134) of the mold (50), and the plastic material in the mold cavity is cooled and hardened. Such cooling of the arm member 52 and the male member 54, in particular, the rate at which the cooling water is guided through these members, is adjusted such that the temperature of the male member adjacent to the lid is kept below the temperature of the female member adjacent to the lid. For example, the male member 52 adjacent to the mold cavity may be maintained at 400 F while the female member 54 adjacent the mold cavity is maintained at 600 F. As a result of such a temperature difference, as the plastic material in the mold cavity is cured, the material in the mold cavity moves over the core member 78 of the male member 52, particularly the male member, And develop between the mold pieces 54 of the arm member. Once the lid is cured, the arm member 54 is removed from the lid. This operation is accomplished by moving the upper member of the arm member 54 upward in the axial direction and radially dropping the lower apparatus of the arm member 54 from the lid. This is done by lifting the cylinder plate 186 and then expanding the clamp plate 66, the cavity plate 60 and the cylinder 184 of the mold apparatus 180 which lifts the mold piece of the mold 50 Loses. As soon as the cavity plate is moved away from the cam, these cams automatically slide outwardly away from the lid along the surface 80 because they are stably held closed by the pressure exerted on the cam by the cavity plate 60.

The next lid is moved away from the male member 54 which includes the strip device 136, the inner core piece 122, the melt pin 130 and the first and second ejector devices 154, The plate 140 is moved upward by the spring 150. As the cavity plate 52 of the arm member 52 is moved upwardly, the plate 140 is moved upwardly by the spring 150. Alternatively, The plate 140 is freely moved upward and the plate 140 is moved upward by the cylinder plate 19 which is securely fixed to the plate 140 of the mold 50 as shown in FIG. As the plate 140 is pushed upwards, the plate first urges the ring 138 upward and then moves the bolt 152, the first ejector device 154 and the inner core member 122 of the core device 78, When the ring 138 is pushed upwards, the ring engages the recesses 114 of the outer core piece 112 The ribs 8 and the threads 4 are pushed out of the recesses 116 to lift the lower portion of the lid upwardly as opposed to pulling the ribs 8 out of the recesses 114, When the ribs 8 are released from the recesses, the lid can not be unstretched but pressed rather than unstacked. The lid thus can be removed from the mold 50 without applying a suitable tensile force to the rigid member 7. [ Can be removed.

The lid removed from the mold 50 has a problem in that it is required to increase the work force because the lid directly to the worker must be rotated in the opposite direction to be separated.

The arm member is maintained at 600 ° F through the water supply passages (72, 134) at the arm member side, and the male member is maintained at 400 ° F to cool the material by the temperature difference. However, since the temperature of the male member is still high, there is a problem that the thread of the lid is damaged by the hard male member during the lid separating operation, thereby producing defective products of the product.

Patent Registration Notice 10-1991-0007518

In order to solve the above problems, the present invention provides a screw-type lid-forming apparatus that effectively cools an inner screw portion of a lid to minimize damage to a screw portion due to frictional resistance when an injection molded article is taken out after molding.

It is another object of the present invention to increase productivity by automating the process of molding and extracting a lid and to reduce waste of manpower.

In order to solve the above problems, the screw type lid forming apparatus of the present invention includes left and right molds; A left core installed in the left mold for molding the outer surface of the lid; A right mold provided in the mold; A right core having a receiving space formed therein; A slider core provided on an outer surface of the right core and forming a screw on an inner surface of the lid; A fixing jig provided on an outer surface of the slider core and supporting the lid; A resin injection core provided in a receiving space of the right core and having a cooling water circulation line for injecting molten resin between the left core, the slider core, and the stationary core and cooling the injected molten resin; And power transmission means installed in the left and right molds for guiding the slider core forward and backward.

Therefore, the screw-type lid-forming apparatus of the present invention has an effect that the screw portion of the lid is effectively cooled to reduce the friction with the slide core when the injection-molded article is taken out, thereby minimizing damage to the screw portion of the lid.

Further, the present invention has another effect of increasing the productivity by reducing the waste of manpower by automating the process of forming and extracting the lid.

1 is a schematic view showing a screw-type lid-forming apparatus according to the present invention,
2 is an enlarged view of a portion "A" in Fig. 1,
3 is an exploded perspective view showing the right core and the resin injection core of the lid forming apparatus according to the present invention,
FIG. 4 is a cross-sectional side view of the right core and the resin injection core shown in FIG. 3;
Figs. 5 and 6 are cross-sectional views illustrating the operation of the lid-forming apparatus according to the present invention.
FIGS. 7, 8 and 9 are schematic views showing a conventional safety lid and a method and an apparatus for manufacturing the same.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 to 5, a screw-type lid-forming apparatus according to the present invention includes movable and stationary dies 200 and 300, a movable core 210 installed on the movable die 200 and forming an outer surface of the lid 210 A stationary core 310 provided in the stationary mold 300 and having a receiving space C formed therein and a stationary core 310 provided on the outer surface of the stationary core 310 and forming a screw on the inner surface of the lid A slide jig 320 installed on an outer surface of the slide core 320 and supporting a lid; a movable jig 330 installed in the accommodation space C of the movable core 310 to receive the movable core 210 A resin injection core 340 in which a cooling water circulation line for injecting molten resin between the slide core 320 and the fixed core 310 and cooling the injected molten resin is formed, And a power transmission means (not shown) for guiding the slide core 320 forward and backward 400).

The movable and stationary molds 200 and 300 may be variously applied to mold a product, and may have a structure capable of simultaneously forming a plurality of lids.

The movable core 210 is formed with a molding groove 220 on the inner side so as to mold the outer surface of the lid.

The stationary core 310 has a hollow shape and has a receiving space C formed therein. The stationary core 310 has an inlet hole 312 for circulating the cooling water supplied from the stationary mold 300, And a molten resin introduced through the resin inflow hole of the resin injection core 340 to be described later is provided in the cavity 314 on the other side of the cavity 314, A discharge hole 315 for injecting the liquid into the cavity is formed.

A packing insertion groove 316 is formed in the coupling groove 314.

The resin-injected core 340 has a body shape and includes a body 341 and a head portion 342 which are coupled to and fixed to the accommodation space C and the coupling groove 314.

A resin injection hole 343 is formed in the center of the body 341 and the head 342 on the same line as the discharge hole 315 of the fixed core 310.

An inlet groove 344 and an outlet groove 345 are formed on the outer side of the body 341 so as to communicate with the inlet hole 312 and the outlet hole 313 of the fixed core 310. The inlet groove 344, An annular groove communicating with the discharge groove 345 is formed, and a packing seating groove 346 is formed in the front surface.

The head portion 342 is inserted into the coupling groove 314 of the fixed core 310 and is coupled and fixed by the fixing means.

A packing 350 is provided in the insertion groove 316 of the fixing core 310 and the mounting groove 346 of the resin injection core 340 so that the airtightness of the fixing core 310 and the resin injection core 340 Thereby preventing leakage of molten resin and cooling water.

The resin injection hole 343 is formed to communicate with the resin injection part 360 of the stationary mold 300.

The slide core 320 is installed to be movable forward and backward while being rotated within the stationary mold 300.

A through hole 321 is formed in the slide core 320 so as to be fitted to the outer side of the fixed core 310. An annular engaging step 322 is provided on one side of the slide core 320, And a second spline gear 324 is provided on the other side.

The fixing jig 330 is installed between the inner side of the stationary mold 300 and the slide core 320 and has an insertion hole 331 to be inserted into the slide core 320, An annular step 332 is formed to be engaged with the stopping jaw 322, and a plurality of support pieces 333 protrude forward.

The support piece 333 is molded together with the injection molding, and fixes the position of the injection molding in the process of injection molding.

The power transmitting means 400 includes a driving shaft 410 rotatably installed in the movable and stationary molds 200 and 300 and transmitting a driving force of a motor not shown in the figure, And a first spline gear 420.

The first spline gear 420 is engaged with the second spline gear 324 to guide the slide core 320 forward and backward.

As described above, according to the present invention, the function and effect of the screw-type lid-forming apparatus will be described. First, the resin is injected into the resin injection hole 343 through the resin injection unit 360, The molten resin flows into the cavity through the discharge hole 315 of the fixed core 310 and the molten resin and the screw 333 of the fixing jig 330 and the screw groove 323 of the slide core 320 The cooling fluid is supplied to the inflow hole 312 side of the fixed core 310 at the time when the molding of the injection molded article is completed and the resin injection core 340 communicated with the inflow hole 312, The annular grooves and the discharge holes 313 of the fixed core 310 and the discharge holes 313 of the fixed core 310 are circulated. The cooling air of the cooling water transferred to the fixed core 310 and the slide core 320 while passing through the inflow groove 344, the annular groove and the discharge hole 313 of the resin injection core 340, And sequentially cooled. When cooling of the lid is completed, the cooling water is cut off and the movable mold 200 is separated from the fixed mold 300. The projections separated from the movable mold 200 are fixed by the supporting pieces 333 of the fixing jig 330. At this time, a screw is formed on the inner surface of the lid by the screw groove 323 of the slide core 320.

In this way, the cooling water circulates between the fixed core 310 and the resin injection core 340, thereby cooling the lid rapidly, thereby reducing the cycle time of the injection molding, thereby maximizing the productivity.

When the driving shaft 410 of the power transmitting means 400 that receives the driving force of the motor transmits a rotational force in a forward direction in this state, the first spline gear 420 rotates the second spline gear The slide core 320 is pivoted and the injection object is pushed forward so that the injection object is separated from the support piece 333 of the fixing jig 330. [

The second spline gear 324 is rotated by the first spline gear 420 so that the slide core 320 rotates as the second spline gear 324 rotates, The screw formed on the lid is rotated in the opposite direction, and the lid is separated from the slide core 320. As a result,

As described above, the lid is effectively cooled, and the damage of the screw portion due to the frictional resistance with the slide core 320 when the lid is taken out is reduced, thereby ensuring the reliability of the product.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. will be.

200: movable mold 300: stationary mold
400: Power transmission means

Claims (3)

Movable and stationary molds (200, 300);
A movable core 210 installed on the movable mold 200 to mold the outer surface of the lid;
A fixed mold (300);
A fixed core 310 having a receiving space C formed therein;
A slide core 320 provided on an outer surface of the fixed core 310 and having a screw groove 323 for forming a screw on the inner surface of the lid;
A fixing jig 330 installed on an outer surface of the slide core 320 and supporting the lid;
A cooling core 310 installed in the accommodation space C for injecting the molten resin between the movable core 210, the slide core 320 and the fixed core 310 and cooling the injected molten resin, A resin injection core 340 in which a circulation line is formed;
A resin injection hole 343 is formed on the inner side of the resin injection core 340. A cooling water inflow groove 344 and a discharge groove 345 are formed on the outer side of the resin inflow core 34 in the longitudinal direction, An annular groove 347 is formed so as to communicate with the discharge groove 344 and the discharge groove 345,
A first spline gear 420 installed on the movable and stationary molds 200 and 300 and adapted to transmit the driving force of the motor to the rotational force of the driving shaft 410, And a second spline gear (324) engaged with the first spline gear (420) to guide the slide core (320) forward and backward;
The fixing jig 330 is formed with a fitting hole 331 to be coupled to the slide core 320 and an annular step 332 formed inside and a plurality of supporting pieces 333 are formed in front of the fixing jig 330 Screw-type lid-forming device.
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